A HandshakeException in the client usually indicates that there was an error during the SSL/TLS handshake process between the client and the server. This can be caused by a number of things, including:
An issue with the client's SSL/TLS configuration, such as an incorrect certificate or a missing root CA certificate.
An issue with the server's SSL/TLS configuration, such as an incorrect certificate or a certificate that has expired.
A network issue that is preventing the client and server from communicating securely.
To troubleshoot this issue, you will need to gather more information about the error. This may involve looking at the client and server logs, examining the client and server SSL/TLS configuration, and potentially capturing network traffic to see what is happening during the handshake process.
It is also possible that the HandshakeException is being thrown due to a problem with the application code, such as an issue with how the client is establishing the SSL/TLS connection or how it is handling the handshake process. In this case, you will need to review the application code and try to identify the root cause of the issue.
If you are having trouble resolving this issue, it may be helpful to seek the assistance of a developer or network administrator who has experience with SSL/TLS and network communication.